Question

AP OPEN SCHOOL SOCIETY, GUNTUR
INTERMEDIATE-PHYSICS(312)
PREPARATORY EXAMINATION-1
TIME- 1 Hour.
SECTION-1
Answer all Questions.
1. Define pressure, density and write its dimensional formula?
2. Show that Impulse is equal to change in linear inomentum?
3. Define Poisson's Ratio and write its units?
4. State the first law of Thermodynamics and its limitation?
SECTION -11​

Answer 1

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1-Density is the mass per unit volume of a substance or object, defined as ρ=m/V. Pressure is the force per unit perpendicular area over which the force is applied, p=F/A. p = F / A . The SI unit of pressure is the pascal: 1Pa=1N/m2 1 Pa = 1 N/m 2 .

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3-Poisson's ratio is defined as the ratio of the change in the width per unit width of a material, to the change in its length per unit length, as a result of strain.

4-The limitation of the first law of thermodynamics is that it does not say anything about the direction of flow of heat. It does not say anything whether the process is a spontaneous process or not. The reverse process is not possible. In actual practice, the heat doesn't convert completely into work.